I was just going to buy the Navionics charts that are available for ios and Android and was really wanting comments on the best performing Tablet GPS. Reading your review the A510 seems to have a good GPS performance and meets most of the other features I need. My present headcam is a ContourHD which records h264 but in a MOV format that I know Android does not support but I am thinking of getting a GoPro Hero2 that records in mp4 that I feel should play. Also has the options of a Bluetooth control too.